Machine for making paper bags



A. FINKE MACHINE FOR MAKING PAPER BAGS Filed July 2'7, 1938 2 Sheets-Sheet 1 Filed July 27, 1938 2 Sheets-Sheet 2 1 5 121 4 B Z2 A g P Y m I] I ll '7 f a E? n E 1 a g I G i e I ll I 7 [7 C B 1:

A. FINKE 2,205,718

MACHINE FOR MAKING PAPER BAGS Patented June 25, 1940 I UNITED/STATES PATENT OFFICE- 2,205,7l8 MACHINE Fon MAKING PAPER BAGS Arno Finke, Lengerich, Westphalia, Germany Application July 27, 1938, Serial No. 221,586

In Germany August 13, 1937 6 Claims.

from the partly finished bag at the-same time as,

or immediately subsequent upon, the cutting of 10 the tube into bag sections, that is, as an intermediate stage in the making of the bag. Since the subsequent stages must be considered, complicated precision mechanism is required for removing the waste end, and is liable to failure, 15 especially at comparatively high operating velocity.

It is an object of my invention to improve a machine of'the kind described by removing the waste end not as an'intermediate, but as the final ;:stage in the making of the bags, so that it is not constrained by consideration of subsequent stages,

To this end, in a machine of the klnddescribed, I provide means for defining a waste end for each bag on the sheet the tube is formed from. Such 25 means may be a pair of rollers which produce scores, creases, or perforations in the sheet before it is formed into the tube. I further provide means, such as a pair of feed rollers and a former plate, for forming a flat tube from the scored 30 sheet, means for finishing the bag by cutting it from the tube, folding its bottom flap, and pasting it to the body, and means for tearing the waste end off each finished bag.

In the accompanying drawings a machine em- 35 bodying. my invention is illustrated diagrammatically byway of example.

In the drawings Fig. 1 is. an elevation, and Fig. 2 is a plan view of the'machlne. 40 Figs. 3, 4, and 5 illustrate three stages in the making of the bags Referring now to the drawings, a sheet I from a roll R is continuously drawn through between a lower scoring roller 2 and an upper scoring 45 roller or sector 3 mounted to rotate between forations by way of example but may be creases or other means for weakening the paper at predetermined points. The scores are straight lines a, a, (1'', etc., extending inwardly from the edge 6' in parallel and spaced relation for about one- 5 third of the width of the sheet i, and similar lines a, d, d", etc., extending inwardly from the other edge l" of the sheet 5. At its inner end, each score has a hook, or angular extension,

I), b, b", etc., for the scores it, etc., and c, c, of, 10 etc., for the scores d etc. including an angle of 45 degs. with the score.

After having been scored by the rollerst and t, and giimmed along its edge i" by a device it,

the sheet I is formed into a tube about the former plate t by the side disks of the feed rollers t. The gummed edge l" is inverted, Fig. 2, and placed on the plain edge I against which it .is pressed by the squeezing roller 6'. In the folded tube, Fig. 3, the scores a" and d" make up a single line across the upper overlapped portion of the tube, and their hooks b" and c" extend into the solid lower portionol the tube from both side edges' The rear edge 8 of the former plate l is toothed and chamfered at an angle of 45 degs. at both ends 8'. The tube moves overthe toothed edge 8 under the push of the rollers 6 and is then engaged by a pair of stripping rollers l. Acutting device is arranged between. the pairs of rollers 6 3 and l and comprises an upper inclined and fixed blade 9 whose, rear edge is toothed and arranged at a short distance ahead of the edge 8. The lower blade i0 is arranged at a short distance to the rear of the edge 8 and is secured on a shaft ill which is mounted to rotate at the side of one of the frame members F.

The rotation of the lower blade in is so timed with respect to the feed imparted to the tube by the rollers 6, that'it engages the tube from 40. below when the scores a", d" have moved a short distance beyond the rear edge 8 of the former blade 4. Owing to the staggering of the toothed edge 8 with respect to the toothed rear edge oi the upper blade 9, the overlapped portion is cut along a line 2 which trails with respect to the line 1 along which the solid portion of the tube is cut so that a bottom flap B is formed on the solid portion which projects beyond the line e. Conversely, in the bag h which is now stripped by the rollers l rotating at higher speed than V the feed rollers 6, the edge e of the overlapped portion projects beyond the edge I of the solid portion, and the, waste end g extends from the score a", d" to the edge e. The waste end g is not removed at this stage but goes to the further A stations with the bag It. It will appear that only one separationof the bag h and its waste end g at e, e and at f, ,f'- is performed while the bagis being made. The second separationtearing the waste end g off the bag h-is performed after the baghas been finished, as will now be de- I scribed.

B is positioned, and the upper roller I2 is supplied withpaste by a gummer 20. The paste is' applied to the overlapping portion at the point against which the bottom flap is pressed, by. a pasting strip It on the upper roller. An intermediate roller 2| presses the flap B'against the 'gummed portion, and the bag, with the waste end g still adhering to it, but otherwise finished, is delivered to a tear-oil device.

This device comprises a supporting roller It on a shaft 22, a retaining roller I5, and a tearofi roller It. The supporting roller It comprises a set of disks arranged in spaced relation and alternately fast and loose on its shaft 22. The

tear-ofi roller l6 comprises a' sector supported by two sleeves 30 on a shaft 26, and recessed opposite the loose disks I4, Fig. 2. The tear-off roller I6 is rotated at a peripheral velocity equal to that of the supporting roller I4 by a spur gear 24 on the shaft 22, and a pinion 25 on the shaft 26. The retaining roller I5 is recessed opposite the fast disks I4 and equipped with points 23 extending into the spaces between the disks. A spur gear 21 on the shaft 22 and a spur gear 28 on the shaft 29 of the retaining roller l5 rotate this roller at a peripheral velocity which is less than that of I4 and I6.

The bag It is delivered to the supporting roller 14 which rotates clockwise, as indicated by the arrow in Fig. 1, and is first engaged by the tearofi' roller I6 and moved .into the position illustrated, without being interfered with by the points 23 of the anti-clockwise rotating retaining roller 15 for the present, but when the bag has arrived in the said illustrated position, the points 23 have advanced so far as to penetrate the waste end g. The bag is now gripped between the sector of the tear-off roller l6 and the fast' disks of the supporting roller I4 by which it is moved toward the delivery and of the machine at the penipheral velocity of both members while the wastee'nd g is retained by the more slowly rotating roller l5. While the waste end a is: thus retained by the pins 23 the bag h moves on until the paper is torn along the perforations a", d and the bag, with its top flap T, is ejected while the waste end 9; upon further rotation'of the retaining roller I5, is deposited in a box II.

The superiority of this method over the known method in which the tearing off of the waste end l is an intermediate stage of the manufacture, will now be realized. In the known method, the

waste end must obviously be separated along two lines, viz. its connection to the tube, and" its connection to the partly finished bag. As mentioned, this requires complicated. mechanisms operating with great precision, as obviously the length of the waste end should be a minimum, and the mechanismmay easily get out of order .on account of its complication. While in the ple means, viz. the toothed rear end of the former plate 4, the toothed rear end of the upper blade I9, and the lower blade l0, and it is not necessary to provide complicated means for the exact location of two distinct operations, as in the old method.. Nor is the severing operation influenced by the velocity of operation. The final stage, the tearing-off of the waste end g along a", d", is performe at a point where it is independent of the intermediate stage, and again by very simple means.

My novel machine therefore is more simple and more reliable than the known machines, and is suitable for high-speed operation.

Another important improvement achieved by my machine resides in the fact that the scores, or lines of perforations, do not extend all over the width of the sheet, as they do in the known machines. As described, the scores are substantially restricted to the overlapped portion of the tube, and only the hooks at the ends of the scores extend into the solid portion. Obviously, the inevit'able weakening of the cross-section by the sincein such cases a considerable pull is exerted on the sheet and the paper tube by the feeding means, so that the stress becomes excessive in a much weakened section, especially when the sheet is formed over the former plate.

The favorable features of my machine permit of extraordinarily high speeds of operation.

While the tear-ofi device ll, I5, I8 has been described as adapted to a. machine for making paper bags, it is understood that it has a wider field of usefulness and can be used wherever strips of paper are separated.

I claim:'

' 1. In a machine for making paper bags from a sheet formed into a tube, means for defining a waste end for each bag on the sheet the tube is formedfrom, by scores extending inwardly from the side edges of the sheet for part of its width only, means for forming the scored sheet into a tube, means for finishing the bags, a supporting roller, a shaftforming part of the supporting roll'r, alternately fast and loose disks on the shaft, a tear-off roller arranged to engage the the fast disks, and a retaining roller arranged to engage the, waste end of the bags together with the loos'e disks and to rotate at a lower peripheral velocity.-

2. In a machine for making paper bags from a sheet formedinto a tube, means for defining a waste end for each bag .on the sheet the tube is formed from, by,.score's extending inwardly from'the sideedges of the sheet for part of its width only, means for forming the scored sheet into a tube, meansfor finishing the bags, 3. supporting roller, a shaft forming part of the supporting roller, alternately fast and loose disks on the shaft, a tear-oil roller arranged to engage the finished-bags together with the fast disks and to rotate at a peripheral velocity equal to that of the fast disks, a retaining roller arranged to engage the waste end of the bags together with the loose disks and to rotate at aklower periphera] velocity, and pins on the retaining roller for penetrating the waste end.

3. In a machine for making paper bags from a sheet formed into a tube, means for defining a waste end for each bag on the sheet the tube is formed from, by scores extending inwardly from the side edges of the sheet for part of its width only, means for forming the scored sheet into a tube, means for finishing the bags, a supporting roller, a shaft forming part of the supporting roller, alternatelyfast and loosedisks seated on the shaft in spaced relation, a tear-off roller arranged to engage the finished bags together with the fast disks and to rotate at a peripheral speed equal toithat of the fast disks, a retaining roller arranged to engage the waste end of the bags together with the loose disks and to rotate at lower peripheral velocity, and pins on the retaining roller extending into the spaces between the disks, for penetrating the waste end.

4. In a machine for making paper bags from a sheet formed into a tube, means for feeding the sheet through the machine, means for defining a waste end for each bag on the sheet the tube is formed from, by scores extending inwardly from the side edges of the sheet for part of its width only, means for forming the sheet into a tube, with the side edges from which the scores extend inwardly, overlapping each other, means for severing the tube in such manner into bags that a bottom flap on the leading end of the solid side of the tube projects beyond the leading end of the overlapped side and forms the bottom flap of each bag, means for finishing the bags by folding and securing the bottom flap to the corresponding bag, and means located rearwardly of the finishing means for tearing the waste end off each finished bag.

5. In a machine for making paper bags from a sheet formed into a tube, means for feeding the sheet through the machine, means for defining a waste end for each bag on the sheet the tube is formed from, by scores extending inside of the tube, and another blade arranged opposite the solid side of the tube at the rear of the first-mentioned blade in the feeding direction; for severing the tube in such manner into bags that a bottom flap on the leading end of the solid side of the tube projects beyond the leading end of the overlapped side and forms the bottom flap of each bag, means for finishing the bags byfolding and securing the bottom flap to the corresponding bag, and means located rearwardly of the finishing means for tearing the waste end off each finished bag.

' 6. In a machine for making paper bags from a sheet formed into a tube, a pair of scoring rollers for defining a waste end for each bag on the sheet the tube is formed from, by scoring the sheet along lines extending inwardly from the side edges of the sheet for part of its width only, means for gumming the sheet at one of its side edges, feed rollers arranged at the rear of the scoring rollers, a former plate arranged between the feedrollersfor forming the scored sheet into a tube, severin'g means arranged at the rear of the rear edge of the former plate, for severing the tube in such manner into bags that a bottom flap at the leading end of the solid side of the tube projects beyond the leading end of the opposite side where the gummed and plain edges of the sheet overlap, and forms the bottom flap for each bag, a pair of stripping rollers at the rear of the severing means, a pair of rollers for folding and pasting the bottom flap to the corresponding bag delivered by the stripping rollers, and means arranged at the rear of the folding and pasting rollers for tearing the waste end off each finished bag.

. ARNO FINKE. 

